Even their authorized dealers sell counterfeit ESP's from time to time (possibly not knowlingly). I know because I ended up with 2 fake ESP's from GuitarCenter, they did take them back and gave me a full refund, when I provided proof that they were fraudulent. However they relisted them shortly after, just as they had when I bought them.
The only way to know for sure if yours is the "real deal" is to take it to an ESP collector (like myself), or a dealer that truly specializes in ESP guitars.
"Even their authorized dealers sell counterfeit ESP's from time to time (possibly not knowlingly)"
How is that possible? How can an authorized ESP dealer uknowingly get a fake ESP? If they're authorized dealers, they get their ESPs straight from ESP. The only way to get fake ESPs would be getting them from someone else, and why would they do that if they are already getting them straight from ESP?